POLYMER COMPOSITION, INTENDED FOR MANUFACTURE OF COVERS AND CAPS Russian patent published in 2019 - IPC C08L23/06 B65D39/00 B65D41/00 C08F210/16 C08F4/659 C08L23/08 C08F110/02 C08F4/6592 

FIELD: chemical industry.

SUBSTANCE: invention relates to a polyethylene composition suitable for the manufacture of covers and caps, which has a density equal to 950–960 kg/m³, the value of the SHI_(1/100), equal to 4–12, MI₂ melt index equal to 0.2 to 2 g/10 min, and is characterized by the relationship between the value of the SF spiral flow (measured in mm at 250 °C/1000 bar/100 mm/s) and the value of the ESCR Έ' (measured in hours), described by the ratio C > 200 – SF, or, alternatively, which has a density equal to 950–960 kg/m, the value of the SHI_(1/100), equal to 4–12, MI₂ melt index, equal to 0.2 to 2 g/10 min, and is characterized by the relationship between the value of the SF spiral flow, the value of the ESCR Έ' and the MI₂ melt index (measured in g/10 min in accordance with ISO 1133 at 190 °C and load equal to 2.16 kg), described by the ratio C > (9800 – 36 × SF – 1000 × MI₂) / 60.

EFFECT: invention relates to a polyethylene composition suitable for the manufacture of covers and caps.

12 cl, 2 dwg, 2 tbl